Stationary induction apparatus



July 21 1925'. 1,546,855

v. M. MONTSINGER STATI ONARY INDUCTION APPARATUS Filed June 13, 1921' Inventor: Vincent. Montsingen H i s Attorney.

Patented July 21, 1925.

UNETED STATES 1,546,855 PATENT OFFICE.

VINCENT M. MONTSINGER, OF PITTSFIELD, MASSACHUSETTS, ASSIGNOR '].0 GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

srAmioNARy mnuorron APPARATUS.

. Application filed June 13, 1921.

To all whom it may concern:

Be it known that I, VINCENT M. MONT- v SINGER, a citizen of the United States, residing at Pittsfield, county of Berkshire. State of Massachusetts, have invented certain new and useful Improvements in Stationary Induction Apparatus, of which the following is a specification.

My invention relates to stationary induction apparatus and has for its general object an improved construction and arrangement of parts which is economical and readily manufactured.

More particularly my invention relates to stationary induction apparatus of the portable shell type, a specific object being an improved housing adapted to support the winding terminals in a safe and accessible manner 7 Small transformersand the like which are adapted for domestic use such as to operate toys, ring bells, light small lamps, etc., do not get the technical care and attention generally accorded to larger electrical apparatus. Consequently it is necessary that this class of device should be made very rugged and as nearly foolproof *as possible. The secondary terminals in particular should be made in a manner not easily knocked oil, nor easily disarranged, and disposed so that there is no uncertainty about the voltage across the connections which are made.

By my invention all these, desiderata are accomplished in a novelv manner, and in a form which is compact and readily manufactured. In the practice of my invention I construct an end cap, such as are provided primarily to protect theends of the the shell type core, with an insulating terminal board or bushing in which all the terminals from the windings at that end are secured rigidly and in a manner not likely windings which pro e ct from either end of Serial No. 477,021.

secondary windings 13. The assembled in- I nor members with the windings 13 thereon are pressed into the assembled outer members to form the transformer proper.

Over the ends of the windings 13 are provided the end caps 14 and 15 which aresecured in place by the assembly bolts 16" which pass through the perforations 17 at each side of the laminations 10 as shown in Fig. 3 and through corresponding perforations 18 in the end caps which register with those in the laminations.

In the cap 14 is an insulating bushing 20 through which passes the cable 21 containing the high voltage leads 22. In use this cable usually leads to a lamp socket or othersuitable electrical outlet.

The cap 15, at the other end, has the in-' sulating member or terminal board 23 which has therein the three terminals 24, 25 and 26 disposed at the apices of an equilateral triangle symmetrically disposed with respect to the centre of the cap, to which terminals are connected the taps or leads 27 leading from the low voltage winding. The

terminal board 23 ,shown comprises inside I and outside insulating plates, sha ed clover-leaf fashion, having openings t roughsubstantially the centre of each of the three lobes. The insulating plates thus formed bush larger openings similarly placed in the cap 15 as shown at 28, such plates being preferably formed in place by dies pressing the same up from suitable insulating compound which .has been applied thereto.

screw with square head 30 which passes through aconducting clip 31 having a rolled edge 32 at one side, the other side being a' straight edge. The rolled edge is anchored against a ledge33 formed in the inner side of the inner plate of the terminal board 23. The head 30 fits snugly against the edge 32 so that it cannot turn. In this manner the terminal 24 is securely stayed in :its termi- The terminal 24 consists of a threaded nal board and has on its outer end a washer and thumb nut and 36 respectively which are adapted .to engage with and hold in place the exterior conductor which is to lead therefrom.

The terminal 25 is similar to terminal 24 in every respect but the screw of terminal 26 is larger than either that of 24: or 25. I find the use of an odd sized terminal of advantage where it is desired to insure the selective attachment of leads thereto. For example, suppose across .terminals 2d and 25 there is a difference of potential of 14 volts as indicated by the legend 14 in Fig. 2; suppose vfurther that across terminals 25 and 26 there are 24: volts, and across terminals 26 and 24 there are 10 volts. Now if the terminals 24 and 25 are particularly adapted to a service where it is desired chiefly of the transformer to supply a small lamp circuit of 14 volts, the leads would then be provided with washer clips having perforations therein of sufficient diameter to embrace only terminals 24: and 25, the clips being spaced apart a distance adapted to fit across this pair of terminals, thereby preventingtheir fitti'ngacross any other pair.

In Fig. t, I have shown an end cap having stamped out insulating plates of hard fiber or similar material, instead of using the molded ones to bush the terminals in the cap .15 shown in Fig; 1. An insulating plate, as shown at 43 inFig. 6, is stamped out in clover-leaf form which with a similar one 43 is adapted to support the terminals 24,

' 25 and 26 rigidly in proper relation; the

heads of each screw being provided with a small prong 45 which is adapted to gouge into and hold such screws against rotation, Which would otherwise twist them loose from the leads from the winding.

Having now described an embodiment of my invention which is the best means at present known to motor carrying thesame into effect, I would have itunderstood that this is merely illustrative and that I do not mean to be limited thereby to the precise details shown, nor restricted in the choice of recognized equivalents except as defined in my claims hereunto annexed.

What I claim as new and desire to secure by Letters Patent of the United States, is,

1. In shell typo induction apparatus, the combination with a core having windings thereon, of an end cap having a perforation, a perforated insulating plate on each face of said end cap, a binding post passing through the perforations in said plates and cap, the inner end of said binding post having a non-circular head, and a clip under the head of said binding post and embedded in said inner insulating plate, said clip having an edge bent into engagement with one side of the head of said binding post to prevent rotation thereof.

2. In shell type induction apparatus, the

combination with a core having windings thereon, of an end cap having a perforation, a perforated insulating plate on each face of said end-cap, a binding post passing through the perforations in said plates and cap, the inner end of said binding post having a noncircular head, and a clip under the head of said .binding post and embedded in said insulating plate, said clip having a hollow rolled edge in engagement with one side of the head of said binding post to prevent rotation thereof and to receive a winding terminal of said: apparatus.

3. In shell type induction apparatus, the combination with a core having windings thereon, of an end cap having perforations therein disposed at the vertices of an equilateral triangle, clover-leaf-shaped insulating plates pressed therein to bush said perforations, terminal binding posts secured in said perforations, and means for anchoring said binding posts against rotation in said plates.

at. In shell type induction apparatus, the combination with a core having windings thereon, of an end cap having about the sentre thereof at the vertices of an equilateral triangle, clo-ver-leaf-shaped plates of insulating material pressed the-rein and arranged to bush said perforations, terminal binding posts secured therein, and clips on the interior ends of said binding posts shaped both to anchor said terminals on said plates against rotation and to receive a winding lead! In witness whereof, I have hereunto set my hand this 9th day of June, 1921.

VINCENT M. MON TSIN GER. 

